Displaying 5 results from an estimated 5 matches for "narrowsearchspacebypickingwinnerreg".
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narrowsearchspacebypickingwinnerregs
2013 Mar 13
2
[LLVMdev] Suggestion About Adding Target Dependent Decision in LSR Please
Hi All,
In the target I am working, we comes cross a situation that the loop
strength reduction
could deliver a better result but currently not, because
1. the algorithm narrows search space by winner registers without
considering
the target preferred format. (NarrowSearchSpaceByPickingWinnerRegs)
2. Cost comparison solely favors the number register without
considering other
Impacts.
For the case one,
NarrowSearchSpaceByPickingWinnerRegs filters by most occurred registers.
ld(basereg, immediate) is a target preferred addressing mode. However, it
may
be deleted because baser...
2013 Mar 14
3
[LLVMdev] Suggestion About Adding Target Dependent Decision in LSR Please
...reserves the existing behavior,
It is not difficult. For example,
For case one, we can define one function like
virtual const SCEV* getTargetPreferredWinnerReg(const SCEV*& ScaledReg,
SmallVector<const SCEV *, 4>& BaseRegs, GlobalValue*& BaseGV)
const;
In NarrowSearchSpaceByPickingWinnerRegs, we can preserves the winner
reg from target and winner reg from the original algorithm if this function
returns NULL, it is just like before
For case two, we can define a general cost from TTI function, like
virtual int getLSRFormulaCost(const unsigned NumRegs,...
2013 Mar 14
0
[LLVMdev] Suggestion About Adding Target Dependent Decision in LSR Please
...> Hi All,
>
> In the target I am working, we comes cross a situation that the loop strength reduction
> could deliver a better result but currently not, because
> 1. the algorithm narrows search space by winner registers without considering
> the target preferred format. (NarrowSearchSpaceByPickingWinnerRegs)
> 2. Cost comparison solely favors the number register without considering other
> Impacts.
>
> For the case one,
> NarrowSearchSpaceByPickingWinnerRegs filters by most occurred registers.
> ld(basereg, immediate) is a target preferred addressing mode. However, it may
&g...
2013 Mar 14
0
[LLVMdev] Suggestion About Adding Target Dependent Decision in LSR Please
...cult. For example,
>
>
>
> For case one, we can define one function like
>
> virtual const SCEV* getTargetPreferredWinnerReg(const SCEV*&
> ScaledReg,
>
> SmallVector<const SCEV *, 4>& BaseRegs, GlobalValue*& BaseGV) const;
>
>
>
> In NarrowSearchSpaceByPickingWinnerRegs, we can preserves the winner
>
> reg from target and winner reg from the original algorithm if this
> function
>
> returns NULL, it is just like before
>
>
>
> For case two, we can define a general cost from TTI function, like
>
> virtual int getLSRFormulaCos...
2013 Mar 15
0
[LLVMdev] Problems about developing LLVM pass on windows visual studio
...For example,
>
>
>
> For case one, we can define one function like
>
> virtual const SCEV* getTargetPreferredWinnerReg(const SCEV*& ScaledReg,
>
> SmallVector<const SCEV *, 4>& BaseRegs, GlobalValue*& BaseGV)
> const;
>
>
>
> In NarrowSearchSpaceByPickingWinnerRegs, we can preserves the winner
>
> reg from target and winner reg from the original algorithm if this function
>
> returns NULL, it is just like before
>
>
>
> For case two, we can define a general cost from TTI function, like
>
> virtual int getLSRFormulaCost(const u...